This statement on shirts and bumper stickers says it all: “Guns Don’t Kill People, People Kill People.” Or “When you ban guns, only the criminals will have guns.” Good guys buy guns from legitimate dealers and register their guns. Bad guys buy guns from other bad guys, who seem to have an endless supply of whatever they wish to purchase. If there were laws to stop this particular flow of guns into the wrong population of people, and it was enforced, that could make a difference.